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Investments in associates and joint ventures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of associates [line items]    
Assets $ 60,665 $ 60,146
Liabilities (39,336) (38,738)
BCE’s share of net assets 756 698
Revenues 22,883 23,793
Total net income (losses) 2,699 3,253
Joint ventures | Associates    
Disclosure of associates [line items]    
Assets 3,953 4,045
Liabilities (2,448) (2,689)
Total net assets 1,505 1,356
Revenues 1,359 2,398
Expenses (1,351) (2,545)
Total net income (losses) 8 (147)
BCE’s share of net income (losses) $ 5 $ (72)